CONTENTS RECEIVING YOUR SHIPMENT................7 ORDERING INFORMATION................7 PRESENTATION ..................8 THE ROTARY SWITCH................... 9 THE FUNCTION BUTTONS................10 THE DISPLAY ....................11 1.3.1 Display Symbols ................11 1.3.2 Measurement Capacity Exceeded (OL) ........12 THE TERMINALS................... 12 THE BUTTONS................... 13 BUTTON ....................
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3.11.1 Frequency Measurement (V) ............25 3.11.2 Frequency Measurement (A) ............26 3.12 TEMPERATURE MEASUREMENT.............. 27 3.12.1 Measurement without External Sensor ......... 27 3.12.2 Measurement with External Sensor ..........27 SPECIFICATIONS ..................28 REFERENCE CONDITIONS................. 28 SPECIFICATIONS UNDER THE REFERENCE CONDITIONS....28 4.2.1 DC Voltage Measurement.............
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Thank you for purchasing a Model 401 Clamp-on Meter. For best results from your instrument and for your safety, read the enclosed operating instructions carefully and comply with the precautions for use. These products must be only used by qualified and trained users.
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PRECAUTIONS FOR USE This device complies with safety standards IEC-61010-1 and 61010-2-032 for voltages of 1000V in category IV at an altitude of less than 2000m, indoors, with a degree of pollution not exceeding 2. These safety instructions are intended to ensure the safety of persons and proper operation of the device.
ORDERING INFORMATION Clamp-on Meter Model 401 ............Cat. #2139.20 Includes set of 2 color-coded silicone insulated test leads, test probes and alligator clips, K-thermocouple with 4mm integrated adapter, soft carrying case, 4x1.5V AA batteries and user manual.
1 PRESENTATION The Clamp-on Meter Model 401 is a professional electrical measuring instrument that combines the following functions: Current measurement Measurement of True InRush™ current / overcurrent Voltage measurement Frequency measurement Continuity test with buzzer ...
THE ROTARY SWITCH The rotary switch has five positions. To access the , functions, set the switch to the desired function. The functions are described in the table below. Figure 2: The Function Rotary Switch Item Function See § OFF mode – Turns the clamp-on meter off AC, DC voltage measurement (V) Continuity test Resistance measurement ...
THE FUNCTION BUTTONS Figure 3: The Function Buttons Item Function See § Holds the last value on the display Lead resistance compensation in the continuity and 3.6.1 ohmmeter functions Selects the type of measurement and configuration functions (AC, DC) Enables/disables display backlighting Enables/disables the MAX/MIN mode Enables/disables the True InRush™...
THE DISPLAY Figure 4: The Display Item Function See § Mode selection display Display of the measurement value and unit 3.5 to 3.12 Display of the MAX/MIN modes Type of measurement (AC or DC) Selected resistance measurement display Low battery indication Temperature unit display 3.4.4 1.3.1...
°C/°F Temperature unit Celsius or Fahrenheit Milli- prefix Kilo- prefix Lead resistance compensation Continuity test Diode test Auto Power Off disabled Low battery indicator 1.3.2 Measurement Capacity Exceeded (OL) The OL (Over Load) symbol is displayed when the display capacity is exceeded. THE TERMINALS The terminals are used as follows: Figure 5: The Terminals...
2 THE BUTTONS The buttons respond differently to short, long, and sustained presses. In this section, the icon represents the possible positions of the switch for the button’s functionality. BUTTON This button is used to: Store and look up the last values acquired specific to each function (V, A, , T°) according to the specific modes previously activated (MAX/MIN, Hz).
(YELLOW) BUTTON (SECOND FUNCTION) This button is used to select the type of measurement (AC, DC) and the second functions marked in yellow next to the relevant positions of the switch. It can also be used to modify the default values in the configuration mode (see §...
BUTTON 2.4.1 Normal Mode This button activates the detection of the MAX and MIN values of the measurements made. Max and Min are the extreme mean values in DC and the extreme RMS values in AC. NOTE: In this mode, the Auto Power Off function of the device is automatically disabled.
2.4.2 The MAX/MIN Mode + Activation of the HOLD Mode Successive presses on Function - Displays the MAX/MIN values detected before the button was pressed. short - When the button is pressed, the last value is held on the display. NOTE: The HOLD function does not interrupt the acquisition of new MAX, MIN values 2.4.3 Access to the True Inrush™...
BUTTON This button is used to display the frequency measurements of a signal. NOTE: This button is not functional in the DC mode. 2.5.1 Normal Mode Successive Function presses on Displays: - The frequency of the signal measured - The present voltage (V) or current (A) measurement 2.5.2 The Hz Function + Activation of the HOLD Mode...
3 USE INSTALLING THE BATTERIES Insert the batteries supplied with the device as follows: Using a screwdriver, unscrew the battery compartment cover (item 1) from the back of the housing. Insert the 4x1.5V AA batteries supplied (item 2), observing polarities. Close the battery compartment cover and screw it onto the housing.
CONFIGURATION As a safety measure, and to avoid repeated overloads on the inputs of the device, configuration operations should only be performed when the device is disconnected from all dangerous voltages. 3.4.1 Configuring the Maximum Resistance for Continuity To configure the maximum resistance allowed for a continuity: With the switch in the OFF position, hold the (yellow) button down while turning the switch to...
2. To change the threshold, press the (yellow) button. The value flashes; each press on the (yellow) button displays the next value. To record the chosen threshold, apply a long press (>2s) on the (yellow) button. A confirmation beep is emitted. When the desired value is displayed, turn the switch to another setting.
3.4.5 Default Configuration To reset the clamp-on meter to its default parameters (factory configuration): In the OFF position, hold the (yellow) button down while turning the switch to , until the "full screen" display ends and a beep is emitted. The "rSt"...
CONTINUITY TEST Warning: Before performing the test, make sure that the circuit is off and all capacitors have been discharged. Set the switch to ; the symbol is displayed. Connect the black lead to the COM terminal and the red lead to the "+" terminal.
RESISTANCE MEASUREMENT Warning: Before making a resistance measurement, make sure that the circuit is off and all capacitors have been discharged. (yellow) button. The symbol Set the switch to and press the is displayed. Connect the black lead to the COM terminal and the red lead to the "+" terminal.
(aligned with the centering marks). The device selects AC or DC automatically according to which measured value is larger. The AC or DC symbol displays blinking in auto detect mode. NOTE: The Model 401 does not measure DC current. 3.9.1 AC Measurement...
3.10 STARTING CURRENT OR OVERCURRENT (True Inrush™) MEASUREMENT To measure a starting current or overcurrent, proceed as follows: Set the switch to , then clamp the jaws around the conductor to be measured. Press the (yellow) button to select AC measurement. Perform a long press on the button.
The measured value is displayed on the screen. 3.11.2 Frequency Measurement (A) Set the switch to and press the button. The Hz symbol is displayed. Clamp the jaws around the conductor to be measured. The measured value is displayed on the screen.
3.12 TEMPERATURE MEASUREMENT 3.12.1 Measurement without External Sensor Set the switch to The temperature (blinking) displayed is the internal temperature of the device. It will be equal to the ambient temperature after a sufficiently long thermal stabilization time (at least one hour). 3.12.2 Measurement with External Sensor The device measures the temperature using a K-thermocouple.
4 SPECIFICATIONS REFERENCE CONDITIONS Quantities of Influence Reference Conditions Temperature: 23°C ±2°C Relative humidity: 45% to 75% Supply voltage: 6.0V ±0.5V Frequency range of the applied signal: 45 to 65Hz Sine wave: pure Peak factor of the applied alternating signal: √2 Position of the conductor in the clamp: centered...
4.2.2 AC Voltage Measurement Measurement 1000V RMS 0.15 to 99.99V 100.0 to 999.9V range 1400V peak (1) Specified measurement 0 to 100% of the measurement range range (2) 0.15V to 9.99V ± (1% R + 10cts) Accuracy ± (1% R +3cts) 10.00 to 99.99V ±...
4.2.4 True Inrush™ Measurement Measurement range 10 to 1000A Specified measurement range 0 to 100% of the measurement range Accuracy ± (5% R + 5cts) Resolution Specific Specifications in PEAK mode in True InRush (from 10Hz to 1kHz): Accuracy: add ± (1.5% R +0.5A) to the values in the tables above. ...
4.2.7 Diode test Measurement range 0.000 to 3.199V Specified measurement range 1 to 100% of the measurement range Accuracy ± (1% R + 3cts) Resolution 0.001V Measurement current 0.55mA Indication: junction reversed or "OL" is displayed when the measured open-circuit voltage >3.199V ...
4.2.9 Temperature Measurement Function External temperature Type of sensor K-thermocouple Measurement range -60.0°C to +999.9°C +1000°C to +1200°C -76.0°F to +1831.8°F +1832°F to +2192°F Specified measurement 1 to 100% of the 0 to 100% of the range measurement range measurement range Accuracy (1) 1% R ±3°C 1% R ±3°C...
MECHANICAL SPECIFICATIONS Rigid polycarbonate shell with over-molded elastomer Housing: covering; UL94 V1 Polycarbonate Jaws: Opening: 1.9" (48mm) Clamping diameter: 1.9" (48mm) LCD display unit Screen: Blue backlighting Dimension: 1.6 x 1.9" (41 x 48mm) Dimension: 10.7 x 3.6 x 1.6" (272 x 92 x 41mm) Weight: 1.32 lbs (600g) with the batteries POWER SUPPLY...
5 MAINTENANCE WARNING Remove the test leads on any input before opening the case. Do not operate the clamp-on meter without a battery case cover. To avoid electrical shock, do not attempt to perform any servicing unless you are qualified to do so. ...
LIMITED WARRANTY The Model 401 is warranted to the owner for a period of three years from the date of original purchase against defects in manufacture. This limited ® warranty is given by AEMC Instruments, not by the distributor from whom it was purchased.